X-Git-Url: http://git.tdb.fi/?p=libs%2Fdemoscene.git;a=blobdiff_plain;f=source%2Fvignette.cpp;fp=source%2Fvignette.cpp;h=e4d7de8f3a848e61c4fd31c6fce8059a550010ed;hp=0000000000000000000000000000000000000000;hb=1e3954a988c6d6d946260019f25a4ad3262e01c4;hpb=b8e89ca72ec17461c6d91bf107a7e4b08cf9eff1

diff --git a/source/vignette.cpp b/source/vignette.cpp
new file mode 100644
index 0000000..e4d7de8
--- /dev/null
+++ b/source/vignette.cpp
@@ -0,0 +1,76 @@
+#include <algorithm>
+#include <msp/gl/mesh.h>
+#include <msp/gl/renderer.h>
+#include <msp/gl/texture2d.h>
+#include "resources.h"
+#include "vignette.h"
+
+using namespace std;
+
+namespace Msp {
+namespace DemoScene {
+
+Vignette::Vignette(float aspect):
+	mesh(get_fullscreen_quad()),
+	shprog(Resources::get_builtins().get<GL::Program>("vignette.glsl"))
+{
+	shdata.uniform("coord_scale", min(aspect, 1.0f), min(1.0f/aspect, 1.0f));
+	set_optical(1.0f, 0.5f);
+	set_natural(1.0f, 1.0f);
+}
+
+void Vignette::set_optical(float pupil, float aperture)
+{
+	if(pupil<0.0f || aperture<0.0f || aperture>pupil)
+		throw std::invalid_argument("Vignette::set_optical");
+
+	float p_sq = pupil*pupil;
+	float a_sq = aperture*aperture;
+	float two_ap = 2*pupil*aperture;
+	shdata.uniform("optical", pupil, aperture, a_sq, a_sq*M_PI);
+	shdata.uniform("optical_range", p_sq-two_ap+a_sq, p_sq+two_ap+a_sq);
+}
+
+void Vignette::set_natural(float radius, float darkening)
+{
+	if(radius<=0.0f || darkening<0.0f)
+		throw std::invalid_argument("Vignette::set_natural");
+
+	float v = pow(2.0f, -darkening);
+	float t_sq = 1/sqrt(v)-1;
+	shdata.uniform("natural", t_sq/(radius*radius));
+}
+
+void Vignette::render(GL::Renderer &renderer, const GL::Texture2D &color, const GL::Texture2D &)
+{
+	renderer.set_texture(&color);
+	renderer.set_shader_program(&shprog, &shdata);
+	mesh.draw(renderer);
+}
+
+
+Vignette::Template::Template():
+	pupil(1.0f),
+	aperture(0.5f),
+	radius(1.0f),
+	darkening(1.0f)
+{ }
+
+Vignette *Vignette::Template::create(unsigned w, unsigned h) const
+{
+	Vignette *vign = new Vignette(static_cast<float>(w)/h);
+	vign->set_optical(pupil, aperture);
+	vign->set_natural(radius, darkening);
+	return vign;
+}
+
+
+Vignette::Template::Loader::Loader(Template &t):
+	DerivedObjectLoader<Template, PostProcessor::Template::Loader>(t)
+{
+	add("optical", &Template::pupil, &Template::aperture);
+	add("natural", &Template::radius, &Template::darkening);
+}
+
+} // namespace DemoScene
+} // namespace Msp